Definition: You are given a question on human aging. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: A shortage of these two vitamins can produce symptoms that mimic dementia:
(A)A and C (B)B6 and B12 (C)B6 and D (D)B12 and E

B